Percussive mechanism



April (primat rzz April 30, 1940. E G. GARTIN PERCUSSIVE MECHANISM Filled Nov. 9, 19:57- 5 sheen-Sheet` 2 III/g. J. i

' jfl-20012020:

Wy l April 30, 1940. E. G. GARTIN I PERCUSSIVE MECHANISM Filed Nov. 9,' 1937 v SShBBtS-Shet 5 April 30, 1940 E, G. GAR-rm 2,199,337

' PERCUSS IVE MECHANISM April 3o, 1940. E G, GARHN' 2,199,337

PERCUSSIVE MECHANISM Filed Nov. 9, 1937 5 Sheets-Sheet 5 ,f1 Fay/1f i3 f 7J 30 /E I j 55 IWIFZZZ: 57%2629 @69072279 Patented Apr. 30,` 1940 vPirrqlelrlr OFFICE rnnousslvn MEoHANsM Elmer G. Gattin, Claremont, N. H., assignor to Sullivan Machinery Company, a corporation of Massachusetts Application November 29 claims.

This application is a continuation-in-part of rlryapplication Serial No. 89,696, led July 9, My invention relates to percussive mechanis 5 and, from different aspects, more particularly to percussive mechanisms having associated with them, Y means for effecting their advance into and/or maintaining them in workingposition and for controlling vtheir operation, to percussive mechanisms having associated with them improved means for automatically effecting a discontinuation of their operation in the event of breakage or displacement ofthe implements 'actuated thereby, and to percussive mechanisms having improved mountings facilitating their removal and replacement so that these operations can be performed in very short intervals of time. Theprovision of mechanism for automatically advancing a percussive motor into cooperative relation with its work, only then initiating the percussive action of said moton'and so arranging the controlling mechanism for said'motor that in the event of breakage of the implement which it actuates, or displacement of the work from cooperative relation with the imp-lement, or of the implement from the work, the operation of the motor will be discontinued, is very desirable; but so far as I am advised this combination of functions hasl not previously been made pos- .'m sible in any' apparatus with'whch I am acquainted. One place Where such an arrangement would be of 'particular utility is in connection with so-called C'ottrell hammers, where' it is undesirable to begin hammering upon the steels which vibrate the plates until the steels have been broughtl into engagementk with the plates, and in which, in the event of breakage of a steel during the period of supply of operating medium to a large number of hammers, such breakage may .40 go undetected for a material period, with possible serious damage under some conditions, and 'with a certainty of the wasting of the motive fluid supplied to the hammer, which no longer vibrates its plate, unless there be provided a protective Aarrangement of the lcharacter hereinv disclosed.

Inv installations such as Athose of the l(Jottrell type, 'it is important, whether there bey automatic feeding o-f the hammer mechanism into cooperation with the plates or whether there be continuous cooperation of the blow-transmitting devices with the plates to be vibrated thereby, that means be made available for effectingv the automatic interruption of motive fluid supply to .se the hammer motors in the event of implement 9, '1937,l serial No, 173,649

breakage or other derangements which terminate the delivery of blows to the desired points. Accordingly, for both hot and cold sides of such implements, I propose to provide automatic shutdown means of improved construction. `xv:5 It is further important with devices such as the so-called Cottrell hammer installations, that the hammering implements (motors) shall be quick ly removable and replaceable so that should vthere be a derangement thereof they may be removedvery quickly and replaced by others; and from that laspect of my invention there are herein disclosed vimproved mounting devices' for hammer motors, enabling quick replacement thereof, there being embodied therewith also others of the inventive features hereinabove described, such as the automatic shut-down lfeature. f f f It is an object of my invention to provide an improved percussive mechanism. It is another ,if object of my inventionto provide an improved, percussive mechanism having vimproved pres sure fluid feeding means therefor. It is a further object vof my invention to provide an improved pressure uid -operated percussive mechanism having improved fluid supply controlling means.` It 'is stilll another object of my invention-to provide an improved pressure fluid op- -erated percussive mechanismy having improved combined feeding and pressure Lfiuid supply conp, trolling meansv- It is'yet a further object of 'my invention `top'rovide an improved apparatus for feedinga percussive motor into/cooperative relation' with its work,y for thereupon, and only` thereupon, admittingz operating iiuid theretoto cause initiation of percussive-action, and to provide means whereby, in the event lof breaking of the implement actuated -by the percussive motor or interruptioniof the 'cooperative relation between said implement andan element towhich, it transmits the blows of the percussive motor, there shall be an autonriatic'v interruption of the motive fluid supply to the percussive motor,` It is another object of my invention to provide an improved combined fluid'supply and hamzmervmotor-mounting mechanism. It is a still further` object of my invention to provide an improved hammer motor mounting mechanism having improved meansfor interrupting the `fluid supply to the hammer mptor in the event that the'limparting of blows thereby to the desired point be prevented, said mechanism providing for the quick and easy dismounting of the hammer motor when desired. ,A These an-d other ob-V55 jects and advantages of the invention will hereinafter more fully appear.

From one aspect of my invention, and in a' preferred embodiment thereof, there may be pro vided a percussive motor guided for movement towards and from. its work, and means for effecting advance of the motor towards its work, and, upon the attainment of cooperative relation with respect to the work, an initiation of iiuid supply to the motor, said advance-eiecting and iiuid-supply-initiating means including means operative in the event of any occurrence which interrupts the delivery of blows struck by said hammer motor to the work, to shut down the hammer motor. More specifically, from this aspect of my invention, there may be provided a percussive motor guided for movement towards and from its work, means providing cylinder and piston elements cooperating to eiTect advance` of the motor towards its work and, upon the attainment of cooperative relation with respect to the work, an initiation of fluid supply to the motor, and means whereby, in the event of any occurrence which interrupts the delivery of blows struck by said hammer motor to the work, relative movement between portions of said motoradvancing mechanism may be effected to shut down the hammer motor.

From another aspect of my invention, and in a simplified embodiment thereof, there may be provided a percussive motor guided for movement towards and from its work and normally maintained in cooperative relation therewith, and having uid supply means so constructed that in the event that the cooperative relation between the motor and its work be terminated, bodily movement of such hammer motor relative to its guiding means may take place to interrupt automatically the fluid supply to said motor.

From still another aspect of my invention there may be provided a percussive motor appropriately positioned in cooperative relation with its work and having associated therewith means whereby the same may be readily removed bodily from its positioning means in a minimum of time.

In the accompanying drawings, in which for purposes of illustration four illustrative embodiments disclosing different aspects of my invention have been shown- Fig. l is a central vertical section through a mechanism in which one illustrative embodiment is incorporated.

Fig. 2 is a View similar to Fig. l showing the parts in a diiTerent relative position, some of the parts shown in section in Fig. 1 being shown in elevation in Fig. 2.

Fig. 3 is a further view showing the parts in still another relative position, slightly more of the disclosure of this gure being shown in section than is the case in Fig. 2.

Fig. 4 is a transverse section on the plane of the line 4 4 of Fig. l.

Fig. 5 is a fragmentary view, similar to Figs. 2 and 3, showing still another position the parts may assume, as in the event of steel breakage or the like.

Fig. 6, which together with Figs. '7 and 8 shows another modiiied embodiment of the invention from the aspects disclosed in Figs. 1 to 5, is a central vertical section through a mechanism in which this illustrative embodiment is incorporated.

Fig. '7 is a view similar to Fig. 6 showing the parts in a diierent relative position, some of the parts shown in section in Fig. 6 being shown in elevation in Fig. 7.

Fig. 3 is still another central vertical section showing still a different position of the parts shown in Figs. 6 and 7.

Fig. 9, which with Figs. l0, ll and 12 shows another embodiment illustrating aspects of the invention, is a central longitudinal vertical section through a mechanism incorporating automatic fluid supply control and automatic pressure-luid-actuated holding means, but lacking automatic feed and starting features common to the embodiments of the invention of Figs. l to 8 inclusive.

Fig. 10 is a View partially in central longitudinal vertical section, showing the structure of Fig. 9 with more parts in elevation, and with parts in different relative position from that of Fig. 9.

Fig. ll is a further view partially in central longitudinal vertical section and partially in elevation, showing still a diierent relative position of the parts of the mechanism illustrated in Figs. 9 and l0.

Fig. l2 is a fragmentary front view of a portion oi the mechanism of Figs. 9 to l2.

Fig. 13, which shows a fourth embodiment, is a View in central longitudinal vertical section through a controlling mechanism embodying cerytain aspects of the invention.

Fig. 14 is a fragmentary view, in front elevationl of a portion of the mechanism shown in Fig. 13.

Referring to the drawings, and rst to Figs. 1 to 5 thereof, it will be observed that a guiding means for a percussive motor and a cylinderforming means, herein provided by the same element and generally designated II, are supported by a suitable frame i2. The guiding means portion i3 slidably guides the external cylinder body it of a percussive motor i5. The cylinder-forming portion i6 of this motor provides a bore i1 in which there is reciprocably mounted a composite piston I8, later described in more detail. Within the cylinder element M of the motor l5 there is arranged the primary cylinder i9 of the motor, within whose bore 2f! a hammer piston 2i is reciprocably mounted. To the rear of the member I9 there are cooperating head and valve-chestforming elements 22 and 23, providing a chamber in which a distributing valve 24 is reciprocably mounted. The distributing valve controls the connection of passage means 25 leading to the rear end of the cylinder bore 20, and passage means 2G leading to the front end of said cylinder bore, alternatively with the pressure fluid supply groove 2l, and the distributing valve is further adapted to effect intermittent communication between the rear end of the cylinder bore 2B and an exhaust passage 28. A front exhaust passage 29 is provided to permit the venting of air from the forward end of the cylinder bore 20 when the striking nose 39 of the hammer piston 2| withdraws from the axial opening 3i formed in the cylinder member I9. The structure of this motor is well known in the percussive tool art, and a further description thereof is therefore unnecessary other than perhaps to state that the distributing valve is pressure-uid-actuated. The rear end of the external cylinder element i4 is provided with a rearwardly projecting reduced portion 39 traversed by a longitudinally extending fluid supply passage 3E which opens into a chamber 3l' in communication through a passage 38 with the supply groove 2'! in the valve chest. The rearward end of the passage 36 f branches laterally, as at39, 40, and communielement 4I will engage an annular surface 64 surcates with openings formed in the periphery of the reduced portion 35'. The piston I8 is slidably mounted upon the periphery ofthe reduced portionI 35 and comprises a forward element 4I having a rearwardly extending sleeve portion 42 which, in the rearward position of the piston relative to the projection 35, seals the passages 39 and 40; and the piston comprises, further, .aI follower element 43 which maintains asuitablel packing, for example' a cup leather 44, in sealing relation with the walls of the cylinder IB. A nut 46 threadedly connected, as at 41, and pinned, as as 48,'against` inadvertent loosening, limits the rearward movement of the piston element 4I relative to the reduced extension 35. The rear end of the bo-re I1 is closed by the head 58, to which a fiuidv supply connection I leads, said supply connection admitting pressure uid, when fluid is admitted to said supply connection itself, to a space 52 above the piston I8. The space within the cylinder I6 belowthe piston I8 is vented to atmosphere, as at 53, and suitable means is provided for normally maintaining the piston I8 and motor I5 in retracted position when the fluid supply to the motor is cut off, such means herein being illustrated in the form of a helicaly spring 54 arranged between a'shoulder 55 at thelower end of the bore I1 and an abutment 55 at the -lower side of the piston I8. A piece of drill steel 58 rhaving a collar 68 limiting its projection inwardly into the forward end of the hammer motor, is arranged to receive theblows of the striking nose 3D and transmit them to a part to be actuated, vibrated, or the like, at 6I.- A suitable retainer 62 is provided to preclude dropping of the element 59 out 'of the chuck (i3v formed in the forward end ofthe motor when the'parts are in retracted position..` It should be` noted that the annular surface at the lower end of piston rounding the base of the reduced rearward extension 35 carried by the motor I5, afterk a `certain movement forward of the piston relative to the drilling motor, as shown inFig. 3. f l

The mode of .operation ofthe apparatus so far described will be readilyunderstood.y It will be appreciated that 'the weight -of the hammer motor I5 and of the blow-transmitting element 59 is held suspended, by means of the rearward projection 35 and nut 46. by the piston I8 in the position of the parts shown in Fig. 1.r It will be appreciated also, of course, that when pressure fluid is admitted to the space 52 there will be applied a substantial downwardly acting force to .the rearward end of the projection 35, aswell as to the upper surface of the piston I8. Accordingly, as the piston I8 moves downward, the

hammer motor will move downward withit, and,

as long as the hammer motor is free to move downward, no downward movement of the piston I8 will take place which is not accompanied by an equal downward motion of the hammer motor, and accordingly no air will .be admitted from the space 52 to the passages 39, 40 and 36 until after downward movement of the hammer motor has been interrupted and downward movement of the piston I8 relative to the hammer motor takes place.

Let us now assume that pressure fluid is admitted through the connection 5I to the apparatus with the parts in the position shown in 1 Fig. 1. There will then be concurrent downward movement of the hammer motor I5 and of the piston, I8 together, until the parts reachl the krearrangement of the apparatus.

positionfshown iny Fig. 2, at which point, the engagement of the forward end of the striking element 59 with the work`6l having caused thev collar 60 to engage the forward end of the vchuck 63, downward movement of the drilling motor will be interrupted. This willnot stop downward movement of the piston I8, however, and

the piston I8 will continue'to move downwardly relative to the then-stationary hammer motorl and rearward projection 35 untilthe position of the parts shown in Fig. 3 is attained.- Iny thisv relative position of the parts, it will be noted that the passages 39` and 48 are inwide open cornmunication with the space 52 above the piston I8, and accordingly motive fluid will'enter passages 38 and 4D and pass through the-passage 36 to the space 3l', through the passage 38 into the y fluid supply groove 21 of the motor valve chest,

and cause operation of the'motor I5. `The positicn of the parts shown in Fig. 3 will be main- *y tained until one of two things occurs: (a) discontinuation of fluid supply through the pipe 5I, or (b) 4interruption of theholding of the hammer motor against further forward movement.

Let us consider the rst of these causes of a Obviously, as soon as pressure supply through the pipe 5I is interrupted, the pressure maintaining the additional compression of the spring 54 will be discontinued and the spring will expand and first force the piston I8 upwardly against the forward side of the nut 46. Thereafter further expansion i ofthe spring will not only continue rearward (upward) movement of the piston I8, but will cause the piston to raise with it the hammer motor and then the implement 58 vuntil all the parts are brought back to the relative position of Fig. 1.

yThevparts will then be ready for a renewed admission of fluid through the pipe 5I to effect l again a forward feeding and an institution `of hammering. It will be noted that there will be no hammering during retraction of the hammer motor. l

Suppose now that while the parts are in the position shown in Fig. 3 and hammering is taking place, the contingency mentionedA under (b) Yabove takes place and something occurs whichk permits further downward movement of thedrilling motor I5 from the positionshown in Fig-3. `v

Suppose, for example, 'that the implement 59 breaks. promptly drop down until it engagedv the retainer If this occurred, the collar would 62, and if the motor continued to operate, there would be both a Waste of air and, depending upon the design of the motor with respect to the nav ture of the blows desired, there might also be a hammering on the front head of the motor of an undesirable nature.v This will not take place, however, for any material time, lfor' immediately upon the freeing of the motor I5 for further downward movement, both gravityy and the pressure acting upon an area equal to the cross sectional area of the reduced extension 35 will cause y the motor to move downward again and the motor fiuidsupply will be immediately cut off, as the passages 39 and 40g are covered by the rearwardly yprojecting sleeve portion'42 of the piston I8. If

the coils of thespring 54 have not been forced into Contact with each other, some vfurther downward movement of the piston I8 may also occur relative to the drilling motor is limited by the engagen'ienty of the forward portion of the piston element 4l with the shoulder ed formed to the outside of the base of the reduced rearward extension 35.

l'f it be-desired to remove the hammer motor and replace it with another one, either in order to effect a cleaning of the motor, an overhauling thereof, or for any other reason, it will be obvious that by merely detaching the retainer 52 from the lower end of the motor and removing the head 5B' the entire motor and. motor feed piston assembly can be very quickly removed and another similar unit put in place.

Referring now to Figs. 6, '7 and 8, it will be observed that a generically very similar embodiment of all the aspects of the invention shown in Figs. l to 5 is likewise disclosed in Figs. 6 to 8.

In these figures, however, a somewhat different arrangement of the feeding devices for bringing the hammer motor into operative relation to the work is shown, and these, which dispense with the packings and built-up feed piston construction of Figs. l to 5, will be brieily described.

It will be observed that the external cylinder body hiof the percussive motor i5 has an elongated, upwardly and rearwardly extending cylindrical reduced portion 35 traversed by an axial uid supply passage 3S and having a transversely extending passage t@ which opens through the mripheral wall of the cylindrical extension 35 at the opposite sides of the latter. A rear head 5i!" is mounted in cooperative relation with the-feed cylinder forming portion i6 and comprises an inwardly projecting portion 65 entering the rear end oi the cylinder portion I6 and a rearward cylinder forming portion of its own, designated 67, having a bore 68 which receives, in close sliding relation, the elongated tubular mem- 'ber 69, whose lower end is engaged, as at 76, by

the spring 54. A suitable nut 46 limits rearward relative movement of the member 68 relative to the member' 35. The feed supply connection 5l opens into the space 52' formed at the upper end of the cylinder bore 58.

The mode of operation orV this construction is so similar to thatv of the embodiment illustrated in Figs. l to 5 inclusive that a vdetailed description is unnecessary. Upon the admission of air through the iiuid supply connection 5i, When the parts are in the position shown in Fig. 6, the pressure will act upon the rearward end of the tubular member 69 and upon the rearward end or" the rearward extension and move these parts down together, compressing the spring 54, to the relative position of the parts shown in Fig. 7, where it will be vnoted that the implement 5s engages the work GI. This will stop downward movement of` the part 35', and the tubular member 69 will then move relative to the portion 35', further compressing the spring 54 until the lower end of the member 69 engages the shoulder 6d on the hammer motor. In the meantime, however, before this engagement takes place, the transverse fluid supply connection Sii will have been uncovered and motive uid will be admitted to the hammer motor to set the san-ie into operation. The same operations occur upon the interruption of fluid supply and in the event of breakage of the implement 59 respectively, that were described in connection with the rst illustrative embodiment of the invention.

It will be noted that in both of these illustrative embodiments I have provided devices simple,

virtually proof: against derangement, durable,` and certain in operation, for eiecting a cooperative relation between the hammer motor and its Work prior to the starting of the percussive operation of the motor, but then automatically effecting an initiation of such percussive operation. It will be noted, moreover, that these mechanisms automatically preclude continued operation of the motor notwithstanding the availability of operating fluid supply, in the event that it becomes impracticable for the blows struck by the motor to be delivered to the intended work. It will be noted, moreover, that the parts of this apparatus automatically return to off position whenever fluid supply is discontinued, and that operation of the motor cannot recommence until after cooperative relation has been eiected between the motor, the implement actuated thereby, and the work.

The rernaining'gures of the drawings show embodiments of certain aspects of the invention, but do not` include the automatic feed and retraction upon initiation and interruption of iluid supply to the mechanism. They do, however; incorporate pneumatic means for forcing the implement, through pressure applied to the hammer motor, into cooperative relation with the work. The devices of Figs. 9 to 14 inclusive iurther provide modified and simplied means for enabling the dissociation of the hammering motor from its mounting, while also disclosing improved means for interrupting motive fluid supply, to the hammer motor and operation of the latter when anything occurs which precludes the transmission of the blows of the hammer motor to the desired point.

Referring first to the embodiment of the invention shown in Figs. 9 to l2, it will be observed that a suitable supporting frame 'I5 is traversed at its lower portion by an opening l through which a blow-transmitting implement Tl having a collar 7'." extends. Mounted between projecting nanges '18, welded or otherwise suitably secured to the rear of the herein-channel-like frame element T5, is a motive uid supply and g hammer-motor-positioning device 1Q. This is supported for swinging movement upon the transversely extending pivot bolt 8d, held in position by nuts 8l at the outer sides of the flanges 78. The member T9 is swingable, upon release of the holding screw 82, to the dotted-line position shown in Fig. ll, or further outwardly if desired. The member i9 is provided with a fluid supply connection 5l opening into a bore 83 which comprisesr portions of different diameters, the upper portion 8f3-being of somewhat larger diameter than the lower portion 85. The hammer motor 8S, which hasy a chuck 87 receiving the shank t3 of the implement Ti, has its rear head member E9 provided with a rearwardly extending cylindrical portion Qt, which is a close t for the smaller of the two bores, 35. It .will be observed that the members 19. and 90 constitute `cylinder and piston elements of a pneumatic means for 'forcing the hammer motor towards the work and, through the hammer motor, pressing the implement into engagement with the work. A longitudinal fluid supply passage 9i extends through the projection fill` and is communicable through a transversely extending interseoting passage 92 with the space within the larger bore S4, this being so since the bore 8N is of greater internal diameter than the diameter of the rearward extension Sil. The hammer motor 86 may be of any suitable construction, and

a construction which is well known has been illustrated and so requires no detailed description.

It will be observed that the forward end of the hammer motor is provided with a reduced extension 93 within which the chuck 8l mainly lies, and this reduced portion traverses the opening 94 is a fixed positioning plate 95, herein vin the form of a piece of angle iron having one of its legs 99 riveted, as at 97, to the frame 15. A shoulder 98 limits the possible inward'or downward movement ofthe hammer motor 36. It will be observed that the structure T9, and the dimensions thereof and of the rearward vextension 90 of the rear head of the motor, are so related to the proportions of the reduced forward end 93 of the hammer motor and the position of the plate 95 that the hammer motor may be moved upward far enough to bring its forward end above the top of the steel shank 80 by further telescoping the extension 90 within the bore 84, as shown in full lines in Fig. 11.

Now, with this description, the mode of operation of this illustrative embodiment will be readily understood. WithV the parts in the position shown in Fig. 9, which is the normal working relation of the parts, upon the supply of operating fluid through the supply connection 5|, the fluid will pass through the bore 84, through the transverse passage 92, through the axial .passage 9|, and cause the hammer motor 85 to operate. It will be observed that the cross passage 92 is very near the lower end of the larger of the two bores 94 in the member 19, and that if the rearward extension 90 were to move down only a short distance, motive fluid supply to the axial passage 9| would be interrupted. Letus suppose now that the `implement 'l'l is broken, andy that the motor 85 is no longer supported by the collar 1l upon the implement. Gravity and the pressure of the motive uid upon the upper end of the rearward extension 90 will then cause further downward movement of the hammer motor 9G to the position shown in Fig. 10, and that will, as shown in the upper portion of 10, bring the cross passage 92 below the top of the smaller` bore B5 and result in interruption of motive fluid supplyA to the motor 69 and stopping of the latter. The parts will remain in this position, irrespective of the turning on or cutting off of motive fluid supply through ,the connection 5| until a new implement Tl is put in place.

Now let us suppose that it is desired to remove the tool' 86 for inspection or any other reason. The screw 02 may be withdrawn, as indicated in dotted linesI in Fig. l1, thereby freeing the member 19 for swinging movement about the pivot bolt 80. By lifting the hammer motor 85 to the full-line position shown in Fig. 1l, it may be freed from the shank 88 of the element 11, and then the motor 86 may be swung by tilting the member 19 as indicated in the dotted-line View of Fig. l1, to such aposition that it may be freelywithdrawn pastthe outer end of the shelf 95. Another ready implement may then have its rearward extension l9|) slid into the bore 83 within Ithe member `|9 to such a position that it may be swung in over and into alinement with the element 1l', and the parts may then again be moved to the position shown in Fig. 9, and upon the lre-insertion of the screw 82 the parts will be locked as shown. Q With reference to this construction it will be evident .that I have disclosed an arrangement in which if hammering ought to be discontinued, due to derangement of parts, this will automatically be effected by the interruptionv of motive fluid supply, and I have also provided a very simple construction which enables the ready,

arranged as in the last described species of the y invention, and a fluid supply connection 5I is also provided. The hammering motor 86 and its associated parts are all the same as in Figs. 9 to i2 inclusive. The shelf 95 of Figs. 9 to 11 is,

however, replaced by another shelf-like member il having an opening |02 snuglyto receive the lower reduced end 93 of the hammering implement 86. 'Ihe member |0| is formed of a piece of angle iron, in the construction shown, and has a vertical portion |03, notched, as at |04, to permit sliding withdrawal by slightly backing off the holding screws |05. It will be observed that this embodiment of the invention, like the one last previously disclosed, includes pneumatic means for forcing the percussively actuated implement into engagement with the work, and that all the species of the invention disclosed by illustrative embodiments include cylinder and piston mechanism effective upon the supply of air thereto to force the hammering motor into cooperative relation with the implement which it actuates land to maintain the latter in cooperative relation with the work proper.

The mode of removing the hammer motor in the `construction last described may now be explained. The screws |05 will be loosened. The

motor 35 will be slid upwardly to its topmost position. The shelf member |0l may then `be detached from the frame by sliding the same upwardly, and as the implement 11 may be tilted far outwardly, it and the shelf may then both be withdrawn past the raised hammer motor. The hammer motor can then be lowered far enough downwardly so that the rearward extension 90 will clear the bottom of the bore 85 and the hammer motor can be withdrawn horizontally bodily from beneath the fluid supply connection and guide member T9. A new hammer motor can then be put in place with the extension 90 entering the bore 85. The hammer motor can'be raised to its uppermost position. The implement with the shelf member IUI surrounding it may be repositioned, the shelf member brought into the desired position with respect to the screws |05, and fixed there, and the hammer motor then lowered down so that its chuck will receive the shank of the implement.

It will be evident that this illustrative embodiment of the invention, from the aspects thereof therein disclosed, also provides for the automatic shut-down of the motor in the event of breakage or displacement of the blow-transmitting implement, and that ready replacement of the hammer motor is possible, although perhaps with slightly more manipulation necessary than in the case of the vstructure of Figs. 9 to 12.

In all the species of the invention the feature of automatic shut-down is present, and the feature of ready replacement of the hammer motor. In some, additional features are also present, as above explained. In all cases, it will be evident that simple and highly effective means for protecting the apparatus and for effecting and/or maintaining the desired relation of the hammer motor to the work, are disclosed.

While I have in this application specically described several embodiments which my invention may assume in practice, it will be understood that these forms of the same are shown for purposes of illustration and that the invention may ce further modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by YLetters Patent is:

l. In combination, a percussive motor, and feeding means therefor including feed effecting means operative only when feeding movement of said motor is interrupted by the establishment of cooperative relation between said percussive motor and its work for opening a fluid supply conduit to said motor and for always closing said conduit prior to the initiation of any retraction of said percussive motor.

2. In combination, a percussive motor, and feeding means therefor including a feeding element subjected to feeding pressure and operative only when feeding movement of said motor is interrupted by the establishment of cooperative relation between said percussive motor and its work for opening a fluid supply conduit to said motor and for always closing said conduit prior to the initiation of any retraction of said percussive motor.

3. In combination, a percussive motor, and feeding means therefor including a feeding element subjected on opposite sides to feeding pressure and to a constantly acting counterpressure and operative only when feeding movement of said motor is interrupted by the establishment of cooperative relation between said percussive motor and its work for opening a uid supply conduit to said motor and for always closing said conduit prior to the initiation of any retraction of said percussive motor.

e. In combination, a hammer motor, a feed cylinder therefor, a feed piston in said feed cylinder comprising portions respectively rigidly and slidably connected with said motor, means cooperating with the latter portion for normally maintaining said motor in retracted relation to its work, and means operative upon relative movement of said portions under the action of feeding pressure, to -admit operating fluid to the hammer motor. Y

5. In combination, a hammer motor, a feed cylinder therefor, a feed piston in said feed cylinder comprising portions respectively rigidly and slidably connected with said motor, means cooperating with the latter portion for normally maintaining said motor in retracted relation to its work, and 4means operative upon relative movement of said portions under the action for feeding pressure after said motor reaches working position, to admit operating fluid to the hammer motor.

6. In combination, a hammer motor, a feed cylinder therefor? a feed piston in said feed cylinder comprising'portions respectively rigidly and slidably connected with said motor, means cooperating with the latter portion for normally maintaining said motor in retracted relation to its work, and means operative upon relative movement of said portions under the'action of feeding pressure when cooperative relationgof said motor with `its work is established, to'admit operating iiuid to the hammer motor and yto interrupt admission of operating uid to said motor notwithstanding the continued existence of feeding pressure in the event that cooperative relation between said motor and its work be interrupted.

'7. In combination, a percussive motor, guiding means therefor, a feed cylinder for `said percussive motor, a feed piston portion rigidly connected with said motor and projecting into said feed cylinder, a feed piston portion having limited longitudinal movement relative to said rst mentioned feed piston portion and also projecting into said feed cylinder, means operative on relative movement between said feed piston portions in one direction to establish a fluid supply connection between the percussive motor and the interior of the feed cylinder, means acting on said second mentioned feed piston portion to effect an opposite relative movement between said portions and to move the percussive motor rearwardly, and means for delivering fluid to said feed cylinder.

8. In combination, a percussive motor, guiding means therefor, a feed cylinder for said percussive motor, a feed piston portion rigidly connected with said motor and projecting into said feed' cylinder, a feed piston portion having limited longitudinal movement relative to said first mentioned feed piston portion and also projecting into said feed cylinder, means including passage means formed in one of said feed piston portions operative on relative movement between said feed piston portions in one direction to establish a fluid supply connection between the percussive motor and the interior of the feed cylinder, means acting on said second mentioned feed piston portion to effect an opposite relative movement between said portions and to move the percussive motor rearwardly, and means for delivering uid to said feed cylinder.

9. In combination, a percussive motor, guiding means therefor, a feed cylinder for said percussive motor, a feed piston portion rigidly connected withV said motor and projecting into said feed cylinder, a feed piston portion having limited longitudinal movement relative to said first mentioned feed piston portion and surrounding the latter and also projecting into said feed cylinder, means including passage means in said first mentioned feed piston portion operative on relative movement between said feed piston portions in one direction to establish a uid supply connection between the percussive motor and the interior of the feed cylinder, means acting on said second mentioned feed piston portion to effect an opposite relative movement between said portions and to move the percussive motor rearwardly, and means for delivering fluid to said feed cylinder.

10. In combination, a pressure fluid actuated work-performing motor, and feeding and controlling means for said motor including a feed cylinder and relatively reciprocable feed piston portions contain-ed in said cylinder and cooperating to control pressure fluid supply to said motor and one portion movable relative to the other portion in one directionto establish supply-on positive interruption of feeding movement of said `work-performing motor by attainment of the latter to working position, and said first portion movable relative to said other portion in the' other direction--to interrupt supply-upon cessation of feeding pressure, said feeding means so arranged that in the revent of freeing of said motor vfor further feeding Amovement said yother feed piston portion will move relative to the first portion also to interrupt supply of pressure fluid to said motor. n

11. In combination, a fluid actuated work-performing motor, and feeding and controlling means for said motor including a feed cylinder and coaxial relatively reciprocable feed piston portions contained in said cylinder and cooperating to control pressure fluid supply to said motor and one portion movable relative to the other portion in one direction-to establish supply-on positive interruption of feeding movement of said Workperforming motor by attainment of the latter to working position and said first portion movable relative to said other portion in the other direction-to interrupt supply-upon cessation of feeding pressure, said feeding means so arranged that-in the event of freeing of said motor for further feeding movement said other feed piston portion will move relative to the first portion also to interrupt supply of pressure fluidto saidmotor.

v1,2. In combination, a lluid actuated work-performing motor, and feeding 'and controlling means `for said -motor including a feed cylinder and `relatively reciprocable feed piston portions contained in said cylinder and cooperating to control pressure fluid supply to said motor and one portionmovable relative to the other portion in one direction-t0 establish supply-on positive interruption of feeding movement vof said work-performing motor -by attainment of the latter to workingY `position and said first lportion movable relative tov said other Vportion 'in` the other direction-to interrupt supply-upon cessation of-feeding pressure, and yielding'means tending to effect said latter movement, said feedin'gmeans so arrangedthat in the event of freeingof said motor for further'feeding n'iovement said other feed piston lportion will move relative tothe iirst portion also to interrupt supply of pressure fluid to said motor.

l3`.'In combination, a pressure fluid actuated work-performing motor, means providing a guideway on which said motor is guided for axial movement,V and combined pressure fluid supply and feeding means for said motor for feeding the latter on said guideway to its work and also controlling -the supply of pressure fluid thereto including a combined feed piston and fluid supply controlling element vassociated with said guideway-providing'means and operative to cut off the iiuid supply to said motor while the fluid supply to said feeding means remains unaffected. v

- 14. Incombination, a pressure fluid actuated work-performing motor, and combined pressure `fluid supply and feeding means forrsaid motor for feeding the latter to its work and also controlling the supply of pressure fluidsthereto including a plurality of relatively movable combined feed piston and fluid supply controlling elements, said elements movabler concurrently with said motor during feeding of the latterl and operative upon relative movementgto cut off the fluid supply to said motor while the fluid supply to said feeding means remains unaffected.

' 15. In combination, a work-performing motor and* combined pressure fluid supply and. feeding means therefor for feeding said motor to its work andalso initiating the supply of operating fluid thereto including a plurality of coaxial combined feed piston and fluid supply controlling-elements.

16. In combination, a Work-performing motor, feedingfmeans therefor, and means for controlling the supply of operating fluid to said motor including cooperating feed effecting portions operative upon a predetermined advance of` said motor to initiate operating fluid supply to the latter, and in the event of further advance of said motor, to cut off said supply.

17. In combination, a work-performing motor,

and ,means 'for feedingand for controlling the supply of operating fluid tosaid motor including cooperating feed effecting portions movable 'bodily with the motor and operative vupon a predetermined advance of-saidrnotorto-initiate operating fluid supply tc the latter, and in the event 'of further advance of said motor, to cut olf said supply.

` 18. Inv combination, a percussive motor having a distributing valve, and means for feeding f saidv motor and for supplying operating fluid thereto including means movable with said motor during feeding movement thereof and axially relative thereto'after feeding movement of said motorv is interrupted by the establishment of cooperative relation between said percussivemotor and itswork, for supplying motive fluidto' said distributing valve. l' y Y vvv19. In.combination, ay percussive motor and means for feedingsaid motor and for supplying operating fluidthereto including relatively movable partsl movable at like, rates in a feeding direction when subjected only to pressure `sufficient to effect feeding' movement of said motor into cooperative relation ,with` thevvork, andone movablewitl'r respect tothe other in said feeding direction, upon thebui'lding uphof'a higher pressure 'in said feeding means when feeding movement is checked by the establishment'ofl cooper- 'ative Vrelation 4betweenjhe motor and -itsfwork,

vto'pen* 'a'conduit for operating fluid ltdsaicl motor. y Y

*20. In combination, ajfluid4 actuated hammering motor, an implement Yactuated thereby, means for forcing said hammering motorH forwardly a predetermined distance into cooperative relationv with said implement wherebythe latter is hammered byA said lmotor including relatively movable cylinder and pistonwelementsjand means for supplying `pressure fluid tosaidcylinder element, andA means for' supplying motive fluid to said hammer ,motor from said *cylinder element through said piston kelement .only when said motor is in said predetermined for Wardposition including means operative upon relative movement between said cylinder and piston elements upon forward feeding movement ofsaid motor beyond said` predetermined position,Y in the event of implement breakageforinterrupting said fluid supply to said motor while the fluid supply to said cylinder element remains uninterrupted.

21. In combinatioma fluid actuated percussivevmotor includinga distributing valve, a guide for said motor relative to which said motorl ls guided for axial movement While said guide remains stationary, means for supplying operating fluid for saidmotor to said valve including coaxial, relatively movable parts, one of whichis stationary and constitutes a portion of said motor guide, said parts providing a fluid-supply passage leading to said valve in one relative position ofl tor, and means for removably supporting said hammer motor in operative relation to said support including a swingable element pivotally mounted on said support and providing a fluid supply conduit and having a bore communicating with said supply conduit, said hammer motor including an element receivable in and snugly fitting said bore and providing a motive fluid passage.

23. In combination, a frame member, a guide mounted thereon and providing an opening for receiving the forward end of a hammer motor, a hammer motor having its forward end received in said opening and positioned thereby, and means supported by said frame and cooperating with the other end of said hammer motor for maintaining the latter in alinement with the axis of said opening including a guideway supported by said framework and a reduced extension at the rear end of said motor slidably receivable in said guideway.

24. In combination, a hammer motor, an implement actuated thereby, and means for supplying operating fluid to said hammer motor only when the motor is in its normal operating position with said implement against the work and interrupting such supply automatically in the event the implement breaks and the motor assumes an abnormal position in advance of aforesaid predetermined normal position including cooperating relatively movable uid conducting means of which one is fixed Ato said motor and provides a rearwardly extending fluid supply passage terminating in transversely extending passages, and the other is effective in a predetermined relation of said parts to occlude said transversely extending passages, and means for continuously supplying uid to said other uid conducting means irrespective of the relation of said rst mentioned uid conducting means with respect thereto.

25. In combination, a percussive motor, an implement actuated thereby, and means for supplying motive iiuid to said percussive motor to effect operation thereof only when said motor is in normal cooperative relation to said implement whereby the latter is percussively actuated by said motor and for automatically interrupting fluid supply only in the event of cessation of such normal cooperative relation including relatively movable elements, one of which is connected in fixed space relation to said motor, for providing a motive fluid supply passage in one relative position of said parts and for interrupting said passage on forward movement of the element fixed to said motor relative to the other element, and means for continuously supplying fluid to said other element irrespective of the relation of said elements with respect to each other.

26. In combination, a fluid actuated hammer motor, an implement actuated thereby, and means for feeding and retracting said motor and controlling motive fluid supply thereto automatically, including a common feeding, retracting and controlling element for retracting said motor and shutting off fluid supply thereto, said element having opposed areas adapted to be subjected to actuating pressures, one area effective when subjected to an actuating pressure to feed said motor and an opposed area effective when it is subjected to an actuating pressure and the pressure on the other area is relieved, to retract said motor.

27. In combination, a pressure fluid actuated percussive motor adapted to actuate percussively a working implement, means providing a guideway on which said motor is guided for axial movement, means for feeding said motor axiallyon its guideway comprising a feed cylinder associated with said guideway-providing means and a feed piston reciprocable in said feed cylinder and operatively connected to said motor whereby movement of said piston relative to said cylinder effects axial feeding movement of said motor, thereby to hold the working implement in operative working relation against the work, means for supplying pressure fluid to said feed cylinder to effect forward feeding movement of said piston, means for supplying pressure :duid to said motor, and means automatically operative upon forward feeding movement of said motor beyond a predetermined limit of forward feeding travel, in the event of breakage of the working implement, for cutting off the supply of pressure fluid to the motor.

28. In combination, a pressure fluid actuated percussive motor adapted to actuate percussively a working implement, means providing a guideway on which said motor is guided for axial movement, means for feeding said motor axially on its guideway comprising a feed cylinder associated with said guideway-providing means and a feed piston reciprocable in said feed cylinder and operatively connected to said motor whereby movement of said piston relative to said cylinder d effects axial feeding movement of said motor, thereby to hold the working implement in operative working relation against the work, means for supplying pressure fluid to said feed cylinder to eect forward feeding movement of said piston, means including the bore of said feed cylinder and passages in a portion of said feed piston for conducting pressure fluid to said motor, and means automatically operative upon forward feeding movement of said motor beyond a predetermined limit of forward feeding travel, in the event of breakage of the working implement, for cutting off the flow of pressure vfluid from said cylinder bore through said passages to said motor.

29. In combination, a pressure fluid actuated l percussive motor adapted to actuate percussively a working implement, means providing a guideway on which said motor is guided for axial movement, means for feeding said motor axially on its guideway comprising a feed cylinder aseffects axial feeding movement of said motor,

thereby to hold the working implement in operative working relation against the work, means for supplying pressure fluid to said feed cylinder to effect forward feeding movement of said piston, means for supplying pressure iiuid to said motor, means automatically operative upon forward feeding movement of said motor beyond a predetermined limit of forward feeding travel, in th-e event of breakage of theworking implement, for cutting off the supply of pressure fluid to the motor, and constantly acting means opposing forward feeding movement of said motor for automatically moving said motor rearwardly on its guideway when the flow of pressure fluid to said feed cylinder is discontinued and the bore of said cylinder is vented to atmosphere.

ELMER G. GARTIN. 

